<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=duanl, initial-scale=1.0">
    <title>段落标签</title>
    <style>
        div:nth-child(2n+1){
            width: 100px;
            height: 70px;
        }
    </style>
</head>
<body>
    <div>
        <div>第一段</div>
        <span>第一段内容</span>
        <div>第二段</div>
        <span>第二段内容</span>
        <div>第三段</div>
        <span>第三段内容</span>
    </div>
</body>
</html>